#include <iostream>
#include <string>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

using namespace std;

#define Retry_Count 5

bool VisitServer(const string &serverip, uint16_t serverport, int *cnt)
{
    // 1.创建套接字
    string inbuffer;
    char server_list[1024];
    size_t m ;

    int sockfd = socket(AF_INET, SOCK_STREAM, 0);

    struct sockaddr_in serveraddr;
    memset(&serveraddr, 0, sizeof(serveraddr));
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_port = htons(serverport);
    inet_pton(AF_INET, serverip.c_str(), &serveraddr.sin_addr); // 将字符串转换为网络字节序
    // serveraddr.sin_addr.s_addr=inet_addr(serverip.c_str());//将字符串转换为网络字节序

    bool ret = true;

    if (sockfd < 0)
    {
        cerr << "socket error" << endl;
        return false;
    }

    // 2.要不要绑定呢？client必须要有IP和Port，需要绑定的，但是不需要用户显示的bind，系统会自动分配一个端口
    // 发起连接的时候，client会被Os自动本地绑定的

    // 2.建立连接
    int n = connect(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)); // 自己进行bind
    if (n < 0)
    {
        cerr << "connect error" << endl;
        ret = false;
        goto END;
    }

    *cnt = 0; // 重连成功后，重置重试次数
    m=read(sockfd, server_list, sizeof(server_list) - 1);
    if (m > 0)
    {
        server_list[m] = 0;
        cout << "服务器提供的列表是：    " << server_list << endl;
    }

    cout << "请你选择服务#    ";
    getline(cin, inbuffer);
    write(sockfd, inbuffer.c_str(), inbuffer.size());
    // cout<<"inbufer"<<inbuffer<<endl;////////////////////////////////////////////
    // while (true)
    // {
        cout << "please Enter#    ";
        getline(cin, inbuffer);
        if (inbuffer == "quit")
            return true; // 如果用户输入quit，则退出循环
        n= write(sockfd, inbuffer.c_str(), inbuffer.size());
        if (n > 0)
        {
            char buffer[1024];
            size_t m = read(sockfd, buffer, sizeof(buffer) - 1);
            if (m > 0)
            {
                buffer[m] = 0;
                cout << "get a echo message " << buffer << endl;
            }
            else if (m == 0) // 服务器关闭
            {
                return false;
            }
            else
            {
                ret = false;
                goto END;
            }
        }
        else
        {
            ret = false;
            goto END;
        }
    // }
END:
    close(sockfd);
    return ret;
}

int main(int argc, char *argv[])
{
    if (argc != 3)
    {
        cout << "Usage:\n     ./udp_echo_client <ip> <port>" << endl;
        return -1;
    }

    string serverip = argv[1];
    uint16_t serverport = atoi(argv[2]);

    int cnt = 1;
    while (cnt <= Retry_Count)
    {
        bool result = VisitServer(serverip, serverport, &cnt);
        if (result)
        {
            break;
        }
        else
        {
            sleep(1);
            cout << "server offonline,retrying..." << cnt << endl;
            cnt++;
        }
    }
    if (cnt >= Retry_Count)
    {
        cout << "server offonline,exiting..." << endl;
    }
    return 0;
}